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Method for converting halftone image, printing method and method for producing halftone shield

A technology of image conversion and halftone, applied in the direction of image communication, electrical components, etc.

Inactive Publication Date: 2011-10-05
QISDA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, a printer may contain only black ink, but after a halftone conversion, it can emulate grayscale

Method used

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  • Method for converting halftone image, printing method and method for producing halftone shield
  • Method for converting halftone image, printing method and method for producing halftone shield
  • Method for converting halftone image, printing method and method for producing halftone shield

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Embodiment Construction

[0039] The following examples specifically illustrate how to carry out the present invention in a preferred manner. The examples are only for illustrating the general application mode, and are not intended to limit the scope of the present invention. The actual scope is defined in the claims.

[0040] figure 2 Schematic diagram of the image conversion method. Raw pixels 202 are converted to halftone pixels 206 by halftone mask 204 . The original pixel 202 may be one or more pixels in the original image, and the values ​​therein represent gray scale values, such as 5. And the halftone mask 204 may be a 3×3 matrix containing 9 elements with values ​​1 to 9 scattered randomly. During the halftone conversion, the original pixel 202 and the halftone mask 204 are overlapped and compared to output the halftone pixel 206, which also has 3×3 elements. In the point-by-point comparison of the original pixel 202 and the halftone mask 204, when the value of the original pixel 202 is ...

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PUM

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Abstract

The invention provides a method for producing a halftone shield and a method for converting a halftone image and a printing method using the same. The invention discloses an embodiment for using discrete wavelet transformation to produce a halftone shield. By adopting the halftone shield, an input image can be converted into the halftone image including a plurality of halftone pixels, and the halftone image is used for printing to output.

Description

technical field [0001] The invention relates to half tone (Half Tone) image conversion technology, in particular to a method for using a discrete wavelet transform (Discrete Wavelet Transform) algorithm to generate a half tone mask. Background technique [0002] Halftone conversion is a method that uses the human eye's visual illusion to increase the degree of grayscale variation. Such technology has been widely used in the field of image processing, including printing, printing and some display technologies. Due to the grayscale variation contained in the original image, it is often higher than the color variation that printing equipment can provide. Therefore, through the halftone conversion, the printing result can be visually restored or simulated the real gray scale change effect. For example, a printer might contain only black ink, but undergo halftone conversion to simulate grayscale. In general, halftone conversion converts an original pixel into multiple fine col...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N1/405
Inventor 李德原
Owner QISDA CORP